CN218723478U - Distribution structure on plate heat exchanger - Google Patents

Abstract

The utility model relates to the field of heat exchange equipment, in particular to a distribution structure on a plate heat exchanger, which comprises a plurality of plate heat exchange sheets overlapped between a front clamping plate and a rear clamping plate; a refrigerant heat exchange cavity and a secondary refrigerant heat exchange cavity are alternately formed among the front clamping plate, the plurality of plate type heat exchange plates and the rear clamping plate, and a refrigerant input channel and a refrigerant output channel which are communicated with the refrigerant heat exchange cavity, and a secondary refrigerant input channel and a secondary refrigerant output channel which are communicated with the secondary refrigerant heat exchange cavity are formed on the front clamping plate and the plurality of plate type heat exchange plates; a distribution plate is arranged in the refrigerant input channel along the channel direction, and through holes are arranged on the distribution plate; the distribution plate divides the refrigerant input channel into a first chamber and a second chamber, refrigerant only enters from the outer end of the first chamber, and distribution holes of the plurality of refrigerant heat exchange cavities are all located in the second chamber. The scheme can greatly improve the distribution uniformity of the gas-liquid mixed refrigerant under medium and low flow rates through the two-time distribution, thereby improving the plate exchange performance.

Description

Distribution structure on plate heat exchanger

Technical Field

The utility model relates to a indirect heating equipment field especially relates to a distribution structure on plate heat exchanger.

Background

In recent years, plate heat exchangers are widely used in refrigeration industry, air conditioning industry, heat pump system industry, heat treatment industry, petrochemical industry, energy industry, waste heat recovery industry and other industries. The construction and operating principle of plate heat exchangers is to use metal sheets having a corrugated pattern and stacked together. A plurality of fluid channels are formed between the metal sheets, so that heat exchange can be carried out between two fluids (such as liquid to liquid or liquid to steam) according to the heat transfer characteristics of the metal sheets, and the heating or cooling purpose is achieved. The plate heat exchanger has the advantages of compact structure, high heat transfer efficiency, small volume, easy maintenance and inspection and the like.

The prior plate heat exchanger can refer to a plate heat exchanger described in Chinese utility model patent text with the publication number of CN2821502Y, and comprises a front outer baffle, a rear outer baffle and a plurality of corrugated plates arranged between the front outer baffle and the rear outer baffle; the front outer baffle, the rear outer baffle and the refrigerant heat exchange cavities and the secondary refrigerant heat exchange cavities which are alternately formed among the plurality of corrugated plates in the front outer baffle and the rear outer baffle, and the refrigerant and the secondary refrigerant realize heat exchange at two sides of the corrugated plates. In practical applications, the fluid of the plate heat exchanger is usually a two-phase mixed fluid, such as a mixed fluid of liquid and vapor, rather than a single-phase fluid, and when a two-phase fluid (e.g., refrigerant) flows into the inlet channel of the plate heat exchanger, the inertia force and gravity force of the liquid (e.g., refrigerant liquid) are greater than those of the vapor (e.g., refrigerant gas), and the momentum of the liquid is much greater than that of the vapor. Therefore, most of the liquid flows forwards to the rear end of the plate heat exchanger of the inlet channel and is far away from the inlet collecting channel, and most of the steam flows upwards in the inlet channel near the collecting port at the front end of the heat exchanger, so that the liquid and the steam flowing into the fluid channel are unevenly distributed, and the heat transfer performance of the plate heat exchanger is affected.

Therefore, in order to solve the problem of uneven fluid distribution at the inlet of the flow channel of the plate heat exchanger, the conventional plate heat exchanger is usually provided with a distributor at the inlet of the flow channel for reducing the area of the fluid inlet to limit the fluid flowing into the flow channel or increasing the flow velocity of the fluid in the flow channel, so as to achieve even fluid distribution in the flow channel. However, the inlet distributor may affect the pressure drop of the fluid flowing into the plate heat exchanger, and may also have an absolute effect on whether the distribution of the fluid between the flow channels is uniform. When the plate heat exchanger has more plates, the pressure drop is concentrated at the inlet of the flow passage, and therefore, the pressure drop at the inlet of the flow passage is also an important factor for determining the integral heat transfer performance of the heat exchanger. The traditional distributor reduces the area of a fluid inlet, effectively improves the flow rate of fluid in a flow channel, but increases the flow pressure drop, influences the fluidity of the fluid, and causes unnecessary pressure loss and fluid unevenness. And further affects the heat transfer performance of the plate heat exchanger.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a distribution structure on a plate heat exchanger, which can greatly improve the distribution uniformity of gas-liquid mixed refrigerant through the above twice distribution, thereby improving the plate exchange performance.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a distribution structure on a plate heat exchanger comprises a plurality of plate heat exchange plates which are overlapped between a front clamping plate and a rear clamping plate; refrigerant heat exchange cavities and secondary refrigerant heat exchange cavities are alternately formed among the front clamping plate, the plurality of plate type heat exchange plates and the rear clamping plate, and refrigerant inlets and refrigerant outlets on the front clamping plate and the plurality of plate type heat exchange plates are correspondingly connected to form a refrigerant input channel and a refrigerant output channel which are communicated with the refrigerant heat exchange cavities; the front clamping plate and the secondary refrigerant inlets and secondary refrigerant outlets on the plurality of plate type heat exchange plates are correspondingly connected to form a secondary refrigerant input channel and a secondary refrigerant output channel which are communicated with the secondary refrigerant heat exchange cavity; the method is characterized in that: the refrigerant input channel is internally provided with a distribution plate along the channel direction, and the distribution plate is provided with through holes along the length direction of the plate body; the outer end part of the distribution plate extends to the inlet end of the refrigerant input channel, and the inner end part of the distribution plate extends to be abutted against the rear clamping plate; the distribution plate divides the refrigerant input channel into a first chamber and a second chamber, refrigerant only enters from the outer end of the first chamber, and distribution holes of the plurality of refrigerant heat exchange cavities are all located in the second chamber.

The above technical scheme is adopted in the utility model, this technical scheme relates to a distribution structure on plate heat exchanger, is linked together respectively on the preceding splint and the polylith plate heat exchanger of the last distribution structure of this plate heat exchanger and constitutes refrigerant input channel, refrigerant output channel, secondary refrigerant input channel and secondary refrigerant output channel. When the plate heat exchanger is used, the refrigerant flows into and is distributed into each refrigerant heat exchange cavity from the refrigerant input channel and then converges to the refrigerant output channel; the secondary refrigerant flows into the secondary refrigerant heat exchange cavities from the secondary refrigerant input channel and is distributed into the secondary refrigerant heat exchange cavities, and then flows together to the secondary refrigerant output channel. The secondary refrigerant and the refrigerant exchange heat at two sides of the plate type heat exchange plate.

In addition, since the refrigerant flowing into the refrigerant inlet channel is a gas-liquid mixture, the problem of uneven distribution described in the background art is caused. The distribution plate is arranged in the refrigerant input channel along the channel direction, the refrigerant input channel is divided into a first chamber and a second chamber by the distribution plate, and the first chamber is communicated with the second chamber through the through holes in the distribution plate. When the refrigerant gas-liquid mixture distributor is used, a refrigerant (gas-liquid mixture) is introduced from the outer end of the first cavity, and is distributed into the second cavity once through the through holes in the distribution plate so as to ensure that the refrigerant gas and liquid are uniformly mixed, and then the refrigerant gas-liquid mixture is sent into the second cavity through the distribution holes in the refrigerant heat exchange cavity. The distribution uniformity of the gas-liquid mixed refrigerant at medium and low flow rates can be greatly improved through the two-time distribution, so that the plate exchange performance is improved.

In a further preferred scheme, the distribution plate is obliquely arranged in the refrigerant input channel, the caliber of the first chamber is gradually reduced from the outer end to the inner end, and the caliber of the second chamber is gradually increased from the outer end to the inner end; and a gap is reserved between the distribution hole inlet of the outermost refrigerant heat exchange cavity and the distribution plate. In the scheme, the distribution plates which are obliquely arranged are adopted, so that the first chamber and the second chamber are both constructed into variable-diameter chambers, and the refrigerant (gas-liquid mixture) is uniformly distributed in the first chamber. A gap is reserved between the inlet of the distribution hole of the outermost refrigerant heat exchange cavity and the distribution plate so as to ensure that the distribution plate is arranged without interfering the normal use of the distribution hole.

Preferably, the distribution hole of the refrigerant heat exchange cavity comprises an inlet section communicated with the second chamber and an outlet section communicated with the refrigerant heat exchange cavity; the caliber of the inlet section is smaller than that of the outlet section. According to the scheme, the inlet section of the distribution hole of the refrigerant heat exchange cavity is made small, so that the secondary distribution is more uniform.

Preferably, the orifice of the inlet section of the dispensing orifice is of an elliptical or football shape.

Preferably, a sealing plate for sealing the outer end cavity opening of the second chamber is disposed at the outer end of the distribution plate, and the refrigerant is introduced only from the outer end of the first chamber by the arrangement of the sealing plate.

Drawings

Fig. 1 is a schematic end view of a plate heat exchanger adopting the inventive structure.

Fig. 2 is a schematic side view of a plate heat exchanger adopting the inventive structure.

Fig. 3 is a schematic perspective view of a plate heat exchanger adopting the inventive structure of the present invention.

Fig. 4 is an enlarged view of a portion a of fig. 3.

Fig. 5 is a schematic cross-sectional view of a refrigerant input channel.

Fig. 6 is a schematic end view of a refrigerant inlet channel.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 to 6, the present embodiment relates to a distribution structure on a plate heat exchanger, which includes a plurality of plate heat exchanger fins 3 arranged between a front clamping plate 1 and a rear clamping plate 2 in an overlapped manner. Refrigerant heat exchange cavities and secondary refrigerant heat exchange cavities are alternately formed among the front clamping plate 1, the plurality of plate type heat exchange plates 3 and the rear clamping plate 2, and refrigerant inlets 101 and refrigerant outlets 102 on the front clamping plate 1 and the plurality of plate type heat exchange plates 3 are correspondingly connected to form a refrigerant input channel 103 and a refrigerant output channel 104 which are communicated with the refrigerant heat exchange cavities. The front clamping plate 1 and the secondary refrigerant inlets 201 and the secondary refrigerant outlets 202 on the plurality of plate type heat exchange plates 3 are correspondingly connected to form a secondary refrigerant input channel 203 and a secondary refrigerant output channel 204 which are communicated with the secondary refrigerant heat exchange cavity. The front clamping plate 1 and the plurality of plate type heat exchange plates 3 in the distribution structure on the plate type heat exchanger are communicated to form a refrigerant input channel 103, a refrigerant output channel 104, a secondary refrigerant input channel 203 and a secondary refrigerant output channel 204 respectively. When the plate heat exchanger is used, refrigerant flows into the refrigerant heat exchange cavities from the refrigerant input channel 103, is distributed into the refrigerant heat exchange cavities, and then is converged to the refrigerant output channel 104. The coolant flows from the coolant inlet channel 203 into the coolant heat exchange chambers and is distributed to the coolant heat exchange chambers, and then merges into the coolant outlet channel 204. The secondary refrigerant and the refrigerant exchange heat at two sides of the plate type heat exchange plates 3.

In the solution shown in fig. 3-6, the refrigerant input channel 103 is internally provided with a distribution plate 4 along the channel direction, and the distribution plate 4 is provided with a through hole 41 along the length direction of the plate body. The outer end of the distribution plate 4 extends to the inlet end of the refrigerant input channel 103, and the inner end of the distribution plate 4 extends to abut against the rear clamping plate 2. The distribution plate 4 divides the refrigerant input channel 103 into a first chamber 103a and a second chamber 103b, and the distribution holes 31 of the plurality of refrigerant heat exchange chambers are all located in the second chamber 103 b. A sealing plate 42 for closing an outer end opening of the second chamber 103b is provided at an outer end portion of the distribution plate 4, and the refrigerant is introduced only from the outer end of the first chamber 103a by the provision of the sealing plate 42. In this configuration, since the refrigerant flowing into the refrigerant inlet passage 103 is a gas-liquid mixture, there is a problem of uneven distribution as described in the background art. The present embodiment is provided with the distribution plate 4 inside the refrigerant input channel 103 along the channel direction, the distribution plate 4 divides the refrigerant input channel 103 into the first chamber 103a and the second chamber 103b, and the first chamber 103a and the second chamber 103b are communicated with each other through the through holes 41 of the distribution plate 4. When the refrigerant gas-liquid mixture distributor is used, a refrigerant (gas-liquid mixture) is introduced from the outer end of the first chamber 103a, and is distributed into the second chamber 103b once through the through holes 41 on the distribution plate 4 so as to ensure that the refrigerant gas and liquid are uniformly mixed, and then the refrigerant gas-liquid mixture is sent into the second chamber 103b through the distribution holes 31 of the refrigerant heat exchange cavity. The distribution uniformity of the gas-liquid mixed refrigerant under medium and low flow rates can be greatly improved through the two-time distribution, so that the plate exchange performance is improved.

In a further preferred scheme, the distributing plate 4 is obliquely arranged inside the refrigerant input channel 103, the diameter of the first chamber 103a is gradually reduced from the outer end to the inner end, and the diameter of the second chamber 103b is gradually increased from the outer end to the inner end. And a gap is left between the inlet of the distribution hole 31 of the outermost refrigerant heat exchange cavity and the distribution plate 4. In the scheme, the distribution plate 4 which is obliquely arranged is adopted, so that the first chamber 103a and the second chamber 103b are both constructed into variable diameter chambers, and the uniform distribution of the refrigerant (gas-liquid mixture) in the first chamber 103a is facilitated. A gap is left between the inlet of the distribution hole 31 of the outermost refrigerant heat exchange cavity and the distribution plate 4 so as to ensure that the arrangement of the distribution plate 4 does not interfere with the normal use of the distribution hole 31.

In a further scheme, the distribution hole 31 of the refrigerant heat exchange cavity comprises an inlet section 311 communicated with the second chamber 103b, and an outlet section 312 communicated with the refrigerant heat exchange cavity. The aperture of the inlet section 311 is smaller than the aperture of the outlet section 312. The scheme makes the inlet section 311 of the distribution hole 31 of the refrigerant heat exchange cavity small so as to ensure that the secondary distribution is more uniform. In a further embodiment, the hole pattern of the inlet section 311 of the dispensing hole 31 is elliptical or football shaped.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims (5)

1. A distribution structure on a plate heat exchanger comprises a plurality of plate heat exchange fins (3) which are overlapped between a front clamping plate (1) and a rear clamping plate (2); refrigerant heat exchange cavities and secondary refrigerant heat exchange cavities are alternately formed among the front clamping plate (1), the plate type heat exchange plates (3) and the rear clamping plate (2), and a refrigerant input channel (103) and a refrigerant output channel (104) which are communicated with the refrigerant heat exchange cavities are formed by correspondingly connecting a refrigerant inlet (101) and a refrigerant outlet (102) on the front clamping plate (1) and the plate type heat exchange plates (3); the front clamping plate (1) and the secondary refrigerant inlets (201) and the secondary refrigerant outlets (202) on the plate type heat exchange plates (3) are correspondingly connected to form a secondary refrigerant input channel (203) and a secondary refrigerant output channel (204) which are communicated with the secondary refrigerant heat exchange cavity; the method is characterized in that: a distribution plate (4) is arranged in the refrigerant input channel (103) along the channel direction, and through holes (41) are arranged on the distribution plate (4) along the length direction of the plate body; the outer end part of the distribution plate (4) extends to the inlet end of the refrigerant input channel (103), and the inner end part of the distribution plate (4) extends to abut against the rear clamping plate (2); the distribution plate (4) divides the refrigerant input channel (103) into a first chamber (103 a) and a second chamber (103 b), refrigerant only enters from the outer end of the first chamber (103 a), and the distribution holes (31) of the plurality of refrigerant heat exchange cavities are all positioned in the second chamber (103 b).

2. A distribution structure on a plate heat exchanger according to claim 1, characterized in that: the distribution plate (4) is obliquely arranged inside the refrigerant input channel (103), the caliber of the first chamber (103 a) is gradually reduced from the outer end to the inner end, and the caliber of the second chamber (103 b) is gradually increased from the outer end to the inner end; and a gap is reserved between the inlet of the distribution hole (31) of the outermost refrigerant heat exchange cavity and the distribution plate (4).

3. A distribution structure on a plate heat exchanger according to claim 2, characterized in that: the distribution hole (31) of the refrigerant heat exchange cavity comprises an inlet section (311) communicated with the second cavity (103 b) and an outlet section (312) communicated with the refrigerant heat exchange cavity; the aperture of the inlet section (311) is smaller than that of the outlet section (312).

4. A distribution structure on a plate heat exchanger according to claim 3, characterized in that: the hole type of the inlet section (311) of the distribution hole (31) is an oval or football shape.

5. A distribution structure on a plate heat exchanger according to claim 2, characterized in that: and a sealing plate (42) for sealing the outer end cavity opening of the second cavity (103 b) is arranged at the outer end part of the distribution plate (4).

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